D-2-Amino-4-methylpentanoic acid

D-2-Amino-4-methylpentanoic acid (CAS No.: 328-38-1) is the D-enantiomer of leucine, a branched-chain amino acid that serves as a valuable tool compound in biochemical and neurophysiological research. While leucine is recognized for its role in protein biosynthesis and contributions to processes such as hemoglobin formation, the D-isomer exhibits distinct functional properties that are not typically associated with its L-counterpart. In experimental systems, D-leucine has been shown to modulate neuronal excitability, including the ability to terminate seizure-like activity even after onset, suggesting involvement in pathways regulating synaptic transmission and network stability. Mechanistic studies indicate that D-leucine selectively reduces long-term potentiation without altering basal synaptic transmission, highlighting its utility in probing synaptic plasticity and excitatory signaling pathways. Although precise molecular targets remain under investigation, its effects are thought to involve modulation of neurotransmitter systems and downstream signaling cascades relevant to neuronal activity. In vitro studies commonly employ concentrations in the micromolar to millimolar range, depending on the model system and assay design. This compound is widely used in cell-based assays and animal models to investigate amino acid signaling, neurophysiological regulation, and the differentiation of stereospecific biological responses, supporting its relevance in early-stage drug discovery and fundamental life sciences research.